Antifeedant and Larvicidal Effects of Some Phenolic Components of Essential Oils Lasp Lines of Introduction Against Spodoptera littoralis (Boisd.)

In our paper, we have tested 12 simple of phenols and 9 phenolic acids for acute toxicity and feeding inhibition on Spodoptera littoralis larvae. It was found that while the phenolic acids showed little or no effect on acute toxicity, all the tested simple phenols caused larval mortality within 24 hours upon application. Lethal doses were successfully estimated for 11 substances using probit analysis. Thymol and carvacrol showed the highest efficiency, for LD50 were estimated as 20 and 27 mu g/larvae, respectively. The tested phenols also showed significantly higher feeding inhibition than phenolic acids. The most significant antifeedant effect was exerted by thymol, where LD50 and LD90 were estimated as 6 and 9 mu g/cm(2), respectively.